The usual "In the criminal justice system" voiceover was replaced by an alternate specific to the Chicago P.D. crossover event for broadcast.
The usual voice over was replaced by an alternate voice over specifically for Law & Order: Special Victims Unit episode "Nationwide Manhunt"/Chicago P.D. episode "The Song of Gregory Williams Yates" crossover event, which is below. "In the criminal justice system some killers are so depraved that it takes multiple police agencies to bring them to justice. This is one of those investigations."
The title "Chicago P.D." was added to the title card for broadcast.